Expansion of Product_{m>=1} (1+m*q^m)^27.

Terms

a(0) =1a(1) =27a(2) =405a(3) =4464a(4) =40203a(5) =312444a(6) =2165643a(7) =13683141a(8) =80031483a(9) =438289140a(10) =2267128413a(11) =11153032425a(12) =52470693387a(13) =237149414523